Portion of a cylinder head



FIG. 1 is a rear elevational view of a portion of a cylinder head of the present invention; and,

FIG. 2 is a front elevational view of a portion of the cylinder head shown in FIG. 1.

The other features of the drawings are not considered part of the design sought to be patented, and have accordingly been shown in broken lines. 

The ornamental design for a portion of a cylinder head, as shown and described. 